Newborn or 0-3 months??

A

So I've been buying clothes here and there and I've bought 6 NB onesies and a couple NB pants. Now I'm thinking why buy NB since 0-3 months will fit him once he's born and for longer. Now I'm questioning if he will even fit in the NB since he's already measuring bigger and I think he's going to be tall like his daddy. How many Mama's out there are buying some NB and do you think it's worth it? I feel like I wasted money.